基于同侧解耦型电场耦合机构的多发射多接收无线电能传输系统

doi:10.19595/j.cnki.1000-6753.tces.221392

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Abstract

In recent years, with the improvement of power supply level, electric-field coupled wireless power transfer (EC-WPT) system with single transmitter and single receiver cannot meet the demands of applications with different power levels. The EC-WPT system with multi-transmitter and multi-receiver can effectively expand the level of output power. For magnetic-field coupled wireless power transfer (MC-WPT) system with multi-transmitter and multi-receiver, there is same-sided coupling between the power transmission channels, which will affect the resonance state of the system and then decrease the transmission performance of the system. Similar to the MC-WPT system with multi-transmitter and multi-receiver, the EC-WPT system with multi-transmitter and multi-receiver will also have the problem of system detuning because of the coupling relationship between the power transmission channels. There are two decoupling methods for MC-WPT system: circuit decoupling method and magnetic path decoupling method. However, the problem of system detuning caused by same-sided coupling of in EC-WPT system with multi-transmitter and multi-receiver has not been paid attention to and effectively solved. In order to fill this research gap, this paper proposes a same-sided decoupled electric-field coupler suitable for EC-WPT system with multi-transmitter and multi-receiver to relive the influence of same-sided coupling of multi-port capacitive coupler on system resonance.
First of all, a typical EC-WPT system with dual-transmitter and dual-receiver is established. Considering the full-capacitance model of the electric-field coupler, the equivalent circuit model of the system is built based on ANSYS Maxwell finite element simulation and the modeling methodof capacitive coupling interface with arbitrary number of ports.Moreover, the effect of the same-sided coupling on the resonance of the system is analyzed. According to the analysis of the system impedance, it shows that EC-WPT systems with the traditional dual-transmit and dual-receive coupler cannot always keep resonant operation under a wide range of loads due to the same-side coupling. Then, the structure of the decoupled coupler based on the separate-plate is proposed, the connecting method of all the separated plates of the coupler is explained in detail. Furthermore, the decoupling effect of the EC-WPT system with the decoupled dual-transmitter and dual-receiver coupler and the decoupling principle and coupling coefficient are demonstrated.The decoupling performance on the condition of x-misalignment and different coupling distance are analyzed. Finally, an experimental prototype with a transmission power of 200W is built to verify the decoupling effect of the EC-WPT system with the same-sided decoupled dual-transmitter and dual-receiver coupler based on the separate-plate.
Specially, the same-sided decoupled effect of the proposed electric-field coupler is verified by the comparison experiment of the same-sided decoupled effect test of EC-WPT system based on the traditional coupler and the separate-plate coupler. In addition, the x-misalignment experiment proves that the proposed coupler still has decoupling characteristics on the condition of the coupler is deviated. The EC-WPT system with dual-transmitter and dual-receiver based on decoupled coupler is constructed with 20 Ω and 200 Ω as DC loads respectively. The experimental results show that the output voltage and current of two inverters are in phase. Comparing the power transmission experiments of EC-WPT system based on traditional coupler and same-sided decoupled coupler under various load conditions, it is proved that the transmission power and efficiency of the proposed system are always higher than those of the traditional system.

Key words： Electric-field coupled wireless power transfer dual transmitter and dual receiver same-sided decoupled coupler

Received: 18 July 2022

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TM724

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	Zhou Wei
	Gao Qiao
	Chen Zelin
	Mai Ruikun
	He Zhengyou

Cite this article:

Zhou Wei,Gao Qiao,Chen Zelin等. Same-Sided Decoupled Electric-field Coupler Based Wireless Power Transfer System with Multi-transmitter and Multi-Receiver[J]. Transactions of China Electrotechnical Society, 0, (): 230616-230616.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.221392 OR https://dgjsxb.ces-transaction.com/EN/Y0/V/I/230616

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